The Union's common agricultural policy remains one of the main obstacles to a successful Doha round.
At such a minute scale, everyday forces such as gravity are not the main obstacles to be overcome.
But Southall added one of the main obstacles facing his quest is funding.
The main obstacles, according to Mr Urquhart, are the comparatively short range of electric vehicles and the lack of places to charge them.
The "quick drop" system was supposed to remove one of the main obstacles to the adoption of electric vehicles, namely the several hours it takes to recharge a flat battery.
There are two main obstacles to increased dynamic oversight.
Topics discussed: the main obstacles and positive responses encountered.
The main obstacles cited by the energy executives surveyed speak for themselves: opposition to expanded drilling in places such as the Arctic National Wildlife Refuge (cited by 33%), environmental concerns (16%) and a lack of investment in energy due to low commodity prices (14%).
With top-ranked Azarenka and Serena Williams on the other half of the draw, Radwanska's main obstacles to reaching the final are 2011 French Open champion Li Na, who beat Olga Goortsova of Belarus 6-2, 7-5 to reach the third round, and potential semifinal rivals Sharapova or No. 5 Angelique Kerber, who advanced with a 6-3, 6-1 win over Lucie Hradecka.
What makes these obstacles surmountable is that the three main participants want the process to begin.
Turning onto the dark main road, he sped up, outrunning the weak headlight, obstacles appearing faster than he could react, feeling as if he were racing forward in the flame of a moving lantern.
Although the images did not directly show water, they showed bright deposits running several hundred meters, seemingly left by material carried downhill inside the crater by running water, occasionally snaking around obstacles and leaving finger-shaped marks diverting from the main flow.
If anyone makes it past all these obstacles, there are checkpoints at the bus station, at railroad yards and on the main roads out of town, complete with dogs to sniff out stowaways.
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